The Day Legacy Models Leave the Subscription Door──In Codex, "Which Login" Decides Which Models You Get
On August 31, OpenAI is ending availability of GPT-5.4 and 5.4 mini in Codex. But it only affects ChatGPT-login users—with API key authentication or via the API, they remain. The replacements are gpt-5.6-terra and gpt-5.6-luna. Here's a rundown of the settings to review and the three paths you can t